node.js - how should I spy on a constructor that is called inside of another object? -

node.js - how should I spy on a constructor that is called inside of another object? -

let's have object has function creates object part of operation.

sinon = require('sinon') chai = require 'chai' sinonchai = require("sinon-chai") chai.use(sinonchai) chai.should() paper = {} paper.origami = require('../assets/src/coffee/origami.coffee').paper.origami describe '#throworigami', -> 'should create origami , throw it', -> m = new monkey() throwspy = sinon.spy(m, 'throworigami') createspy = sinon.spy(paper, 'origami') # next function creates origami, 'throws' @ m.throworigami(); createspy.should.have.been.calledwithnew throwspy.should.have.been.calledonce

the monkey class has require @ top paper.origami.

i can test pass if create origami within test, won't pass if leave create within of monkey object. suspect because require paths differ between 2 objects -- maybe node doesn't see them same object.

question: can sinon spy spy on creation of origami object happens within monkey object?

require resolves paths before looking in cache, should not matter paths different. however, create new paper object origami property in test. hence, when spy on paper, 'origami', property origami of paper object created locally in test file replaced spy. suppose next instead:

paper = require('../assets/src/coffee/origami.coffee').paper

if alter paper object, same used in monkey module. however, suggest using proxyquire spy or mock on dependencies.

node.js testing coffeescript sinon